1. com.imooc.oa.controller创建servlet
package com.imooc.oa.controller;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.imooc.oa.entity.User;
import com.imooc.oa.service.UserService;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.LinkedHashMap;
import java.util.Map;
@WebServlet("/api/login")
public class LoginServlet extends HttpServlet {
private UserService userService = new UserService();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setContentType("application/json;charset=utf-8");
//接收用户输入
String username = request.getParameter("username");
String password = request.getParameter("password");
//调用业务逻辑
Map<Object, Object> result = new LinkedHashMap<>();
try {
User user = userService.checkLogin(username, password);
//处理结果编码,0代表处理成功,非0代表处理失败
result.put("code", "0");
result.put("message", "success");
Map<String, User> data = new LinkedHashMap<String, User>();
data.put("user", user);
result.put("data", data);
}catch (Exception e){
e.printStackTrace();
result.put("code", e.getClass().getSimpleName());
result.put("message", e.getMessage());
}
//返回JSON结果 要先添加pom.xml
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
String json = objectMapper.writeValueAsString(result);
response.getWriter().println(json);
}
}
2. pom.xml
<!--Jackson JSON处理包-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.3</version>
</dependency>
